Fix missing initializing in BarSettingsDestroy which caused segfault
Fix missing initializing in BarSettingsDestroy which caused segfault

Thereby avoid freeing a NULL pointer

twahlfeld/pianobar,johndeeney/pianobar,Vi1i/pianobarfly,johndeeney/pianobar,gnowxilef/pianobar,bmbove/pianobar-save,tchajed/pianobar,DavidZemon/pianobar,bmbove/pianobar-save,johndeeney/pianobar,johnso51/pianobar,Vi1i/pianobarfly,tchajed/pianobar,DavidZemon/pianobar,twahlfeld/pianobar,bmbove/pianobar-save,gnowxilef/pianobar,twahlfeld/pianobar,gnowxilef/pianobar,Vi1i/pianobarfly,Vi1i/pianobarfly,DavidZemon/pianobar,bmbove/pianobar-save,tchajed/pianobar,twahlfeld/pianobar,johnso51/pianobar,johndeeney/pianobar,Vi1i/pianobarfly,johnso51/pianobar,bmbove/pianobar-save,tchajed/pianobar,tchajed/pianobar,johnso51/pianobar,johnso51/pianobar,gnowxilef/pianobar,gnowxilef/pianobar,DavidZemon/pianobar,tchajed/pianobar,johndeeney/pianobar,twahlfeld/pianobar,twahlfeld/pianobar,johndeeney/pianobar,DavidZemon/pianobar,johnso51/pianobar,gnowxilef/pianobar,DavidZemon/pianobar